package com.shangye.core;

import com.shangye.http.HttpServletRequest;

import java.io.*;
import java.lang.reflect.MalformedParameterizedTypeException;
import java.net.Socket;
import java.net.URISyntaxException;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Map;

/**
 * 该线程任务负责处理与某个客户端的一次HTTP交互。
 * 由于HTTP协议要求客户端和服务端采取一问一答的原则，因此这里处理与客户端的一次交互规划
 * 为三个步骤:
 * 1:解析请求(将客户端发送过来的请求内容读取到)
 * 2:处理请求(根据请求内容进行对应的处理)
 * 3:发送响应(将处理结果回馈给浏览器)
 * 断开连接
 */
public class ClientHandler implements Runnable {
    private Socket socket;

    private static File rootDir;
    private static File staticDir;

    static {
        try {
            rootDir = new File(ClientHandler.class.getClassLoader().getResource(".").toURI());
            staticDir = new File(rootDir,"static");
        } catch (URISyntaxException e) {
            e.printStackTrace();
        }
    }

    public ClientHandler(Socket socket) {
        this.socket = socket;
    }

    @Override
    public void run() {
        try {
            // 1,解析请求
            HttpServletRequest request = new HttpServletRequest(socket);
            // 2,处理请求
            String path = request.getUri();
            System.out.println(path);
            // 3,响应请求

            File file = new File(staticDir, path);
            System.out.println("文件是否存在：" + file.exists());
            int statusCode;
            String statusReason;
            if (file.exists()){
                statusCode = 200;
                statusReason = "OK";
            }else {
                statusCode = 404;
                statusReason = "NotFound";
                file = new File(staticDir,"root/404.html");
            }

            OutputStream out = socket.getOutputStream();
            //发送状态行
            //HTTP/1.1 200 OK(CRLF)
            println("HTTP/1.1 " +statusCode + " " + statusReason );
            //发送响应头
            //Content-Type: text/html(CRLF)
            println("Content-Type: text/html");
            //Content-Length: 2546(CRLF)
            println("Content-Length: "+file.length());
            //单独发送回车+换行表达响应头发送完毕
            println("");

            FileInputStream fis = new FileInputStream(file);
            byte[] data = new byte[1024*10];
            int len ;
            while ((len = fis.read(data)) != -1) {
                out.write(data,0,len);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            try {
                socket.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }


    }
    private void println(String line) throws Exception{

        OutputStream out = socket.getOutputStream();
        out.write(line.getBytes(StandardCharsets.ISO_8859_1));
        out.write(13);
        out.write(10);


    }



}
